Sorry for the delay, missed your reply! This is with Gallery 2.2.6, using mysqli, with phpBB 3.0.2 using mysqli.
Gallery debug gives me this:
Code: › file_exists(/home/discover/g2data/cache/module/_all/0/0/GalleryFactoryHelper_loadRegistry.inc) Unimplemented: GalleryUrlGenerator getParameter cookie.path for core plugin file_exists(/home/discover/g2data/cache/module/core/0/0/0.inc) getParameter session.lifetime for core plugin getParameter session.inactivityTimeout for core plugin
(mysqli): SET NAMES "utf8"
file_exists(/home/discover/g2data/cache/module/_all/0/0/GalleryStorage_describeMap.inc)
(mysqli): SELECT g_userId, g_remoteIdentifier, g_creationTimestamp, g_modificationTimestamp, g_data FROM g2_SessionMap WHERE g_id='330c028d5bf6e38bd690f99fda4f023c'
[1224028972] can't guarantee 5 -- extending! file_exists(/home/discover/g2data/cache/entity/0/2/24.inc) [1224028972] can't guarantee 300 -- extending! getParameter id.adminGroup for core plugin getParameter id.allUserGroup for core plugin getParameter id.everybodyGroup for core plugin
(mysqli): SELECT g2_UserGroupMap.g_userId, g2_User.g_userName FROM g2_UserGroupMap, g2_User WHERE g2_UserGroupMap.g_groupId = 3 AND g2_UserGroupMap.g_userId = g2_User.g_id ORDER BY g2_User.g_userName LIMIT 2
file_exists(/home/discover/g2data/cache/entity/0/2/28.inc)
Fatal error: Call to undefined method user::getId() in /home/discover/public_html/phpBB3/includes/acp/acp_gallery2.php on line 955